Television receiver



Oct. 16, 1934. SCHROTER 1,977,409

TELEVISION RECEIVER Filed July 25, 1933 Biff/M52 INVENTOR FPalTZ S ROETEH BY AZ? M Patented Oct. 16, 1934 UNITED STATES PATENT OFFICE TELEVISION RECEIVER of Germany Application July 25, 1933, Serial No. 682,067 In Germany July 11, 1932 2 Claims.

The present invention relates to television devices and particularly to receiving and image producing devices used therein.

Television receiving devices have been disclosed in the prior art in which in each aperture of a spirally perforated disk there is inserted a punctiform luminous source, for instance a glow discharge tube. The luminosity of such discharge tubes is controlled in accordance with the distribution of light and dark in the picture to be transmitted. An appreciable disadvantage of such an arrangement resides in the difiiculty of making a relatively large number of entirely similar glow discharge tubes.

To overcome these objections the idea Was suggested to substitute for a plurality of constituent distributed luminous sources a spirally curved luminous tube secured on the back of a disk having a series of holes along a spiral line and to have the apertures of the said disk illuminated posteriorly.

The present invention discloses ways and means to increase the economy in using this type arrangement by choosing a special form for the glow lamp. I'he demand to get along with a comparatively low operating voltage, on the one hand, and the demand to insure the highest possible luminous intensity, on the other hand, constitute cross purposes. If the luminous tube consists of a capillary tube the diameter of which is but little larger than the size of the aperture in the perforated disk, a high working potential is required. By increasing the diameter, to be sure, a lower voltage will be possible; but, on the other hand, a far smaller portion of the generated light will be actually utilized.

The present invention suggests a way to combine the merits of both arrangements in a successful manner, while obviating the drawbacks of the same. This is accomplished by employing for the luminous tube, in general, such a diameter that the operating potential may be chosen inside practically permissible limits, and that at those points where openings are in the perforated disk, the tube is constricted so that a many times larger luminous density is there produced.

One television receiver in accordance with the invention is illustrated on the attached figure.

Referring thereto 1 represents the rotating spirally perforated disc, 2 is the shaft driving the disc and 3, 4, 5 are 3 apertures situated on the outer end of the spiral. A gaseous discharge tube is supported by said disc and arranged along the path of the several apertures forming the spiral. The luminosity of the discharge tube is controlled by the output of the receiver 15. The electrodes of the tube are designated by 6 and 7. Behind the apertures 3, 4, 5 the cross section of the discharge tube is reduced as illustrated by 8 and 9 (in the same way the discharge tube is formed over the full length of the spiral). Between the constricted parts 8, 9, 10 the diameter of the tube is considerably enlarged, so that the voltage drop is much lower there and less electrical power is converted to light than in the parts of small cross section. The luminous density therefore is only in the recesses sufficient for the purpose of the device. The electrode 6 is connected by a lead 11 immediately to the metal body of the device. The electrode 7 is connected by an insulated wire 12 to the slip ring 13, towhich the control voltage is applied by the brush 14.

Having thus described the invention, what I claim and desire to secure by Letters Patent is the following:-

1. A television receiver comprising a disk having spirally arranged apertures therein and a continuous gaseous discharge tube supported by said disk and arranged along the path of the several apertures forming the spiral, said discharge tube having constrictions at points coinciding with the location of the several apertures whereby upon the application of controlled signal currents to the gaseous discharge tube the luminous glow resulting is intensified in the area adjacent the spirally arranged apertures.

2. A television receiver comprising a rotary disk element and a continuous gaseous discharge device spirally arranged upon the disk element throughout at least one circumference thereof, said discharge device having a plurality of constricted areas substantially equally spaced throughout the length thereof and said disk element having an aperture arranged adjacent each constricted portion of the discharge tube whereby upon the application of signal voltages to the discharge tube the intensity of glow discharge observable is increased.

FRITZ scHRoTER. 

